If you not plan to use classes maybe could start with:
*import multiprocessingimport numpy as npimport sysimport pyqtgraph as
pgimport ReadDatadef main(): global curve1, matrix_main # global
qapp matrix_main = np.memmap('myData.dat', dtype='float64',
mode='w+', shape=(5000, 5)) p =
multiprocessing.Process(target=ReadData.worker) p.start()
qapp=pg.mkQApp() win1 = pg.GraphicsWindow() win1.setWindowTitle('Data
plot') win1.show() p1 = win1.addPlot() index = int(matrix_main[0,
0]) curve1 = p1.plot(matrix_main[:index, 2], pen='k') #
qapp.processEvents() timer = pg.QtCore.QTimer()
timer.timeout.connect(update1) timer.start(1000)
sys.exit(qapp.exec_())def update1(): global curve1, matrix_main #
global qapp index = int(matrix_main[0, 0])
curve1.setData(matrix_main[:index, 2]) # qapp.processEvents()main()*
P.S. I am not sure that processEvents is necessary, so I commented it out.
Good luck,
Vasilije
On Fri, Aug 5, 2016 at 7:06 PM, <[email protected]> wrote:
> Hi All,
>
> I have recently started using Python and pyqtgraph so apologies for a
> rather basic question. I am trying to read some data from a file and plot
> it using pyqtgraph (as given in the code below). All the plot
> initialization is done in the main function and then the plot is updated
> through a QTimer. However, when I try to run this code, it returns the
> error:
>
> QtGui.QApplication.instance().exec_()
> AttributeError: 'NoneType' object has no attribute 'exec_'
>
> Any help with this would be much appreciated.
>
> Thanks.
>
> import multiprocessing
> import numpy as np
> import sys
> import pyqtgraph as pg
> from pyqtgraph.Qt import QtCore, QtGui
> import ReadData
>
> def main():
> matrix_main = np.memmap('myData.dat', dtype='float64', mode='w+',
> shape=(5000, 5))
>
> p = multiprocessing.Process(target=ReadData.worker)
> p.start()
>
> win1 = pg.GraphicsWindow()
> win1.setWindowTitle('Data plot')
>
> p1 = win1.addPlot()
>
> index = int(matrix_main[0, 0])
> curve1 = p1.plot(matrix_main[:index, 2], pen='k')
> pg.QtGui.QApplication.processEvents()
> timer = pg.QtCore.QTimer()
> timer.timeout.connect(update1)
> timer.start(1000)
>
> def update1():
> global curve1, matrix_main
> index = int(matrix_main[0, 0])
> curve1.setData(matrix_main[:index, 2])
>
> if __name__ == '__main__':
> if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
> QtGui.QApplication.instance().exec_()
> main()
>
>
>
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